| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 140 | 81 |
| 2015 | 134 | 94 |
| 2014 | 155 | 90 |
| 2013 | 149 | 93 |
| 2012 | 136 | 93 |
| 2011 | 136 | 91 |
| 2010 | 117 | 94 |
| 2009 | 120 | 90 |
| 2008 | 146 | 83 |
| 2007 | 128 | 83 |
| 2006 | 99 | 85 |
| 2005 | 83 | 87 |
| 2004 | 72 | 87 |
| 2003 | 59 | 87 |
| 2002 | 44 | 93 |
| 2001 | 37 | 96 |
| 2000 | 34 | 96 |
| 1999 | 36 | 93 |
| 1998 | 33 | 92 |
| 1997 | 29 | 93 |
| 1996 | 27 | 92 |
| 1995 | 24 | 94 |